A Discontinuous Analog Differential Signal Frequency and Phase Acquisition Method

Abstract

The invention belongs to the field of simulation signal collection and conditioning. The method mainly solves a problem of comparator output oscillation caused by non term zero level of non-continuoussimulation differential signals, false pulse problem caused by signal interference or level jitter and a problem that frequency can be collected and phase cannot acquired. According to the invention,on the basis of a traditional frequency collection circuit of filtering amplification, zero-pass comparison and pulse counting, through constructing another channel of reference signals, a problem ofcorrect output incapability of a comparator in an equal input condition and a problem of false pulse generated by interference signals are solved; and through conditioning of signal generated by zerocomparison and reference signals, square wave signals having identical frequency and identical phase of simulation input signals are generated and DSP, CPU or programmable logic is adopted for capturing and frequency and phase information of the simulation differential signals is obtained.

Description

technical field [0001] The invention belongs to the field of analog signal acquisition and conditioning, in particular to a method for determining the frequency and phase of an analog differential signal. It can accurately and real-time collect the frequency and phase information of the discontinuous analog differential signal, and can be applied to various engine speed, torque and other signal collection equipment to realize accurate collection of sensor output signals. Background technique [0002] The frequency of the analog signal can reflect the change speed or acceleration information of the signal in real time, and the phase of the analog signal can reflect the position information or state information of the signal in real time. These information belong to the basic parameters of general periodic signals. In the acquisition of signals such as engine speed and torque It has a wide range of applications, and accurate acquisition of the frequency and phase of the analog...

AI Technical Summary

Problems solved by technology

However, for non-continuous analog signals, when the zero-crossing comparison circuit is working, the voltage at the positive and negative ends of the comparator is equal due to the long-term zero level, resulting in output oscillation; input low-frequency signal interference or jitter at zero level will cause comparison The device outputs false pulses; if the comparison threshold of the comparator is changed, the signal frequency can be collected correctly but the phase of the original signal cannot be obtained

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